On Lenovo-T60 with Ati Mobility Radeon (radeon-driver) I get a flickering display when in init 3. The screen goes blank every 10 seconds for some milliseconds and comes back. This does not happen when in KDE/init 5 and was not with kernel 3.1-0.slh.2.

I compared dmesg and other logs between the .2 and .3 Kernel, looking for differences or errors regarding vga/video/radeon/framebuffer and such. Nothing obvious. No interesting entrys in Xorg.0.log as this happens when directly booting from grub into init 3, but not in X. Will stay with last kernel for a while and see what happens with the next ones.

Info: it's not gone with Kernel .slh.5
What tools other than top/htop can observe what "happens in the system"? Perhaps I could see what flashes every 10 seconds. And for me still not in X, but init 3 or Strg+Alt+F1, so some Framebuffer-Thing?

I need some feedback to debug this issue further, as I unfortunately can't reproduce it locally. Please test each (well, only the ones for your architecture, of course) of these kernels individually and report which kernels are working and which expose your KMS/ tty flickering. Furthermore I'd need the output of the files/ commands below for a working (3.1-*) and a non-working (3.1-*) kernel[1]:
- dmesg
- lspci -nnvvvvv (only once, this doesn't change between kernel versions)
- /var/log/Xorg.0.log